Abstract
A numerical simulation of an open-channel flow with a side cavity was carried out by the use of a large eddy simulation (LES). In this study, 1-equation model was used and Froude number was set to 0.1. This is because Kimura et al. pointed out that the fluctuations of free surface are negligibly small in such a low Froude number flow. The time-averaged velocity vector, distributions of the Reynolds stress and kinetic turbulent energy are similar to those of experimental data which were obtained by Nezu et al. with a laser Doppler anemometer (LDA). It was found that the instantaneous velocity vector is quite different from the time-averaged one. The calculated flow field is almost 2-dimensional in the vertical direction except for very near the bed. This result corresponds to the experimental data which was shown by Nezu et al. by making use of a particle image velocimetry (PIV) The vortices which were generated by the shear instability between the main channel and the side-cavity are quite coherent ones.
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